Growth of Zinc Oxide Single Crystals by Vapor Phase Reaction

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Abstract
ZnO single crystals are grown by vapor phase reaction with ZnI2 source. When the growth region is maintained between 1150°C and 1200°C, crystals grow by oxidation, and between 970°C and 1020°C, by hydrolysis. Crystals are mainly needles 15 mm in length or plates 8 mm2 in area. Patterns suggesting their growth mechanisms are observed in their microphotographs. The present experiments confirm the conclusion that concerning the needle-like growth, the complete {101̄0} surfaces develop from the root to the tip and from the edges toward the central part, and that the oriented growth on the {0001} planes begin preferentially and then proceed toward the edges of the hexagonal geometry. Concerning the plate-like growth, it is interpreted by the two-step mechanism that the layer growth on the (0001) and (0001̄) surfaces of the needles and whiskers begins after the oriented growth on them has finished.

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